/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.variable;

import java.util.Arrays;

import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;

/**
 * @author Tom Baeyens
 */
public class DeserializedObject {
    SerializableType type;
    Object deserializedObject;
    byte[] originalBytes;
    VariableInstanceEntity variableInstanceEntity;

    public DeserializedObject(SerializableType type, Object deserializedObject, byte[] serializedBytes, VariableInstanceEntity variableInstanceEntity) {
        this.type = type;
        this.deserializedObject = deserializedObject;
        this.originalBytes = serializedBytes;
        this.variableInstanceEntity = variableInstanceEntity;
    }

    public void flush() {
        // this first check verifies if the variable value was not overwritten with another object
        if (deserializedObject == variableInstanceEntity.getCachedValue() && !variableInstanceEntity.isDeleted()) {
            byte[] bytes = type.serialize(deserializedObject, variableInstanceEntity);
            if (!Arrays.equals(originalBytes, bytes)) {

                // Add an additional check to prevent byte differences due to JDK changes etc
                Object originalObject = type.deserialize(originalBytes, variableInstanceEntity);
                byte[] refreshedOriginalBytes = type.serialize(originalObject, variableInstanceEntity);

                if (!Arrays.equals(refreshedOriginalBytes, bytes)) {
                    variableInstanceEntity.setBytes(bytes);
                }
            }
        }
    }
}
